/* 先删除默认的内外边距 */
* {
  margin: 0;
  padding: 0;
}
html {
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
  font-size: 62.5%; 
}
body,input,button,a,textarea,select {
  margin: 0;
  font-family:"Helvetica Neue", Helvetica,"Hiragino Sans GB","Microsoft";
  font-size: 1.4rem;
  line-height: 1.5;
  color: #333;
}
html,body {
  width: 100%;
  height: 100%;
  margin: 0;
}
a {
  text-decoration: none;
}
a:hover,a:focus {
  text-decoration: none;
}
a:hover{
  filter: alpha(opacity=90);
  opacity: .9;
}
.tc {
  text-align: center;
}
.tr {
  text-align: right;
}
.tl {
  text-align: left;
}